rain is big concern in daly city. after a huge mudslide caused city crew today's take pro-active measures. amy hollyfield is live in daly city where it is already starting to rape. >> there is a light rain falling. this is what they've prepared for. this is what they've been worried about. city crews prepared the park and hillside. they have lined the trouble areas with hay bales and net to go absorb mud, water and debris if necessary. city officials they feel confident it will hold. >> so even if the homes are going to be affected. >> the engineers took a look what needs to get done. hopefully what they decided should happen works. >> reporter: this is their fear, a repeated of the mud and water invasion they experience order tut because of a water main break. city officials say they think they've covered all their bases but the final layer of protection, they have asked everyone to keep an eye out through the weekend as it rains. if they see any trouble spots to call in immediately. amy hollyfield, "abc 7 news." >>